Machine for making products of plastic material.



'No.vemzv; V PATENTE-D AUC. 2s, 1904.

. W. E. JAQUBS. MACHINE PCR MAKING PRODUCTS CP PLASTIC MATERIAL.

APPLICATION FILED .TUNE 23, 1902.

IIC' MOMI..4

3 SHEETS-SHEET 1.

A, ATTO/mms TATLNTLD'AUG. 23, 1904.

. w. E. JAQUES. i MAGHINL TOR MAKINGr PRODUCTS 0T PLASTIC MATERIAL.

APPLICATION FILED JUNE 233-. 1902.

3 SHEETS-SHEET 2.

lIsm MODEL.

vNo. 768,127. A I .PATENTBD AUC. 2s, 1904.

1 i W. Iz. JAQUES.

MACHINE TCR MAKING PRODUCTS CT PLASTIC MATERIAL.

v APPLIGATION FILED JUNE 23, 1902.

NO MQDBL. Y 3 BHEBTS-SHEET 3.

'hrm y"C C @MTI- 93 w1 2S? 7L 5 All I f Mii/ lA A I MM. T l """W 'l-Hg..2 "l\\\ v I f C llxm''i" l n, i

l l l ff fz W 'M HH y i MII HV `mlliii 35 V/// l -v I AAL, A Holm/SysUNITED STATES Patented August 23, 1904.

VPATENT OFFICE.

` wILLIAM E. JAoUEs, or GRAND RArIDs, MICHIGAN.

MACHINEfFOB MAKING PRODUCTS OF PLASTIC MATERIAL.

SECIFIOATION forming part of Letters Patent No'. 768,127', dated August23,1904.

Application lgd June 23,1902. Serial No. 112,819. (No model.) I

T all whom t muy con/067%.-

Be it known that I, WILLIAM E. JAQUEs, a citizen ofthe United States ofAmerica, residing at Grand Rapids, in the county of Kent and State ofMichigan, have invented certain new and useful Improvements in Machinesfor Making Products of Plastic Material; and I hereby declare thefollowing to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it pertains tomake and use the` same.

This invention relates to improvements in machines for making productsof plastic material, and more'especially to a machine well adapted foruse in making bricks or blocks or other products of cement or artificialstone4 and comprising a forming-die arranged in a horizontal plane, aplunger for forcing the plastic material throughthe die, a hopper argerreturn into the outlet of the hopper, and

the additions made to the bar during successive pressure-exertingstrokes of the plunger are uniform, and the said baris permitted toremain at rest during the rearward or' idle. strokes of the plunger toaccommodate the cutting or severing of a brick or section from the saidbar.

Another object is to provide -the formingdie of the machine with alongextension corresponding interiorly in cross-section and endelevation with the thickness of the plastic bar which is to be formed byand within the die, and thereby to obtain greater pressure upon `themass forming the-said bar and Vto more properly and more closely forcetogether the particles of the materials which compose .the bar, andthereby to effect a greater compression of the said materials, or, inother words, the object of the said extension of they die in thedirection in which the bar of plas- .tic material is forced during theformation and lengthening of thebar is to exert upon the bar, all roundthe bar, the friction or resistance required to retard the progress ofthe bar and to increase the pressure on the bar and to` materiallyenhance the compactness of the mass composing the bar by utilizing thetendency of the said mass to expand whenever more material is added tothe bar aty the inner end of the bar by pressure exerted by the plungerduring the pressure-exerting strokes of the plunger.

Another object is to provide means whereby the forward movement orIprogress of the plastic bar is arrested soon after the commencement ofthe operation of the machine and a farther advanceof the bar is avoideduntil the die has been completely and most compactly filled up to itsreceiving extremity, whereupon the said bar-arresting means is removedor rendered inoperative, and the resistance to the bar by the internalwalls of the die extension whenever the bar tends to expand by pressureexerted upon its inner end by the plunger results in additional pressureupon the bar and insures a well-formed bar of great compactness, afeature of paramount importance in making products of cement orcementitious material.

Another object is to provide suitable means for cutting or severi-ngsections from the plaswidthwise and vertically to the vsaid bar andwhich are .adapted to be left in their inserted position with thesections cut thereby from the bar to prevent the sticking of the sectionlast cut from the bar to the outer end of the remaining portion oftheunsevered bar and to the next proceeding section and to prevent thesticking together of any two sections cut from the bar before thesetting' of the cement or material composing the said sections.

With these objects in view and to render the machine compact and simpleand durable in construction and reliable-in its operation and to realizeother advantages hereinafter IOO appearing my invention consists incertain features of construction and combinations of parts hereinafterdescribed, and pointed out in the claims.

In the accompanying drawings, Figure I is a side elevation, largely incentral section, of a portion of a machine or apparatus embodying myinvention. Figs. II and III are side elevations in section of a portionof the machine not illustrated in Fig. I. Fig. IV is a vertical sectionon line IV IV, Fig. II, looking inwardly. Fig. V is a transversevertical section on line V V, Fig. III, looking in the directionindicated by the arrow. Fig. VI is a top plan in section on line VI VI,Fig. I. Fig. VII is a vertical section on line VII VII, Fig. II, lookingin the direction indicated by the arrow. Fig. VIII is a vertical sectionon line VIII VIII, Fig. III, looking inwardly. Fig. IX is a top plan inhorizontal section on lines IX IX, Fig. V. Fig. X is a side elevation,largely in section, of a` portion of the machine and shows the plungerin position at the completion of its forward or pressureexerting stroke.Fig. XI is a side elevation, largely in section` corresponding with Fig.X, except that in XI the plunger is shown at the end of its rearward oridle stroke and the valve-forming slide is shown in an open position.

Referring to the drawings, a designates an ordinary open-endedforming-die of a brickmachine, which die is arranged in a horizontalplane and has its chamber gradually reduced in dimensions from its innerand receiving end outwardly toward the outer and discharging end of thedie.

rhe die a has an extension c, which projects in a horizontal planeoutwardly in the direction in which the bar of unset cement orplasticmaterial, formed by and within the die, is forced. rIhe dieextension c is formed by a suitably-applied open-ended boX or case, andof course the passage-way formed by and interiorly of the said dieextension corresponds in end elevation and cross-section to thethickness of the bar I) forced into and through the die extension, whoseinternal walls snugly incase and are instrumental in sleeking ortroweling or smoothing the said bar.

The bar may be severed into sections vertically and transversely at anysuitable point between the ends of the die extension c, preferably asuitable distance from the inner end of the said extension, and the topof the conduit where the severing operations can take place is providedwith a slot or aperture d, as shown in Figs. II, III, VII, and VIII, toaccommodate the introduction and operation of a severing blade or knifee.

rIhe bar I) is intermittently forced along the passage-way formed by andinteriorly of the die extension c by a plunger f, with which the machineis provided. The cement or plastic material is prepared and thendelivered in advance of the plunger f. b v which it is forced throughthe die fr. and the die extension c. The die obviously communicates,therefore, with the path of the plunger j. which path is formed in linewith the die u. by and within a case g, which forms a guide for theplunger.

Above the forward end of and in close proximity to the case (l is ahopper I, which is provided at its lower end with adownwardlydischarging opening or outlet N, arranged to communicate withthe chamber of the said case and with the chamber ofthe die when thevalve-forming slide j, which is adapted to close the said outlet frombelow, is in an open position, as shown in Fig. XI. By the relativearrangement of the parts and the operation of mechanism hereinafterdescribed it will be observed that the valve j is in its closed positionduring the pressure-exerting stroke of the plunger, that the said valvedoes not begin to open until the plunger has commenced its rearward oridle stroke, that material drops from the outlet of the hopper into thechamber of the casey/ in advance of the plunger and into the chamber ofthe die a as soon as the said valve begins to open, and that the saidvalve again closes before the next succeeding pressure-exerting strokeof the plunger commences. It will be observed also that none of thematerial fed to and in advance of the plunger preparatory to apressure-exerting stroke of the plunger can return during the saidstroke of the plunger to the outlet of the hopper, that the feed ofmaterial is uniform, that the additions to the column or bar emergingfrom the outer and discharging end of the die extension c are` uniform,and that the said bar rests during the rearward or idle strokes of theplunger, so as to accommodate the cutting or severing of a section fromthe said bar.

In Figs. II and VII a knife a is shown in position ready to be forcedinto the passageway formed by and within the die extension, and in Figs.III and VIII the said knife is shown introduced into the saidpassage-wav, and consequently inserted into and transversely ofthe bar7). The said knife f' is a thin metal plate which corresponds indimensions vertically and widthwise to the depth and width,respectively, of the said bar. 'Ihe said knife is left in its insertedposition between the section cut thereby from the bar b and the outerend of the remainder of the bar and prevents sticking of the saidsection to the said remainder of the bar and to any section next in:ulvance of it. 'lhe said knife is advanced toward the outer anddischarging' end ol the conduit during the next succeeding forward andpressure-cxerting stroke of the plunger a distance equal to the lengthof the addition made to the. bar during the said stroke of the plunger,and the IOO die extension c, as already indicated, extends far enoughoutwardly in the direction of its said end beyond the place at which thesevering operations take place to cause a brick or section 7c cut fromthe bar to be moved long enough in contact at its upper and lowersurfaces and at the ends with the internal walls of the die extension toresult in thesleekingv or troweling of the said section upon its saidsurfaces and to rebuild or repair any broken or mutilated corners oredges -of the said section, and hence it will -be observed that anyroughness or imperfections occasioned at or l along the corners or edgesof a brick or section /r during the severing operatlon are subis placedin proper position at the said end of y the die extension, as shown inFigs. Il and HI.

The pallet p is arranged upon and longitudinally of ahorizontally-arrangedstationary table t, which extends in under' andlongitudinally of the outer portion of the die extension. The table z5extends far enough beyond the outer and discharging end of the dieextension to accommodate the movement of the said pallet from itsextreme inner and normal position, as shown, endwise and outwardly andto render the said pallet capable of receiving from the conduit thesection or sections f: cut from the bar while the bar is at rest betweentwo successive pressure-exerting strokes of the plunger. v

' To reduce the slight descent of a section or product emerging from theouter and dis-` charging end of the die extension c on'to they pallet toa minimum, and thereby avoid injury to the said product, (and the latteris easily injured, because the cement or artificial stone Aof which itis composed has not yet set,) the bottom of the passage-way formed bythe outer portion of the die extension between the outer extremity ofthe die extension inwardly longitudinally of the said die exten-l sionas far as the pallet normally extends in under the said bottom is formedby a thin metal plateZ, having a smooth upper surface and set into, asat m, and suitably secured to the bottom ofthe die extension at theinner'y The plate Z is supported, therefore, only at its inner endv and`has the capability of yielding to any load thereon and sag onto thepallet extendingend of the said plate.

thereunder.

A stop for limiting the inward mov-ement I prises a wall 0, arranged atand transversely of the inner end of the table t `between the,

'said table and the plate l and facing toward the outer end of thetable.

The addition made to the bar during each pressure-exerting stroke of theplunger is just large enough to make a predetermined product-one largebrick, block, or section 7c, as illustrated-and if, therefore, such addition to the bar during each pressure-exerting strokel of the plungerwere twelve inches long a section twelve inches long would be cut orsevered from the bar by the knife e inserted into the passage-way formedby the die extension, as aforesaid, between two successivepressure-exerting strokes of the plunger.

The table t has the pallet-bearing surfaces thereof formed, preferably,by suitably-applied rollers r, which are arranged in a horizontal planeand extend transversely of the table. Obviously the rollers r can bereadily driven by suitably-applied mechanism (not shown) at the speedrequired to move the pallet endwise in unison with the movement of thebar or such mechanism may be omitted and the friction hadv between thepallet and the product or load arriving upon the pallet as the saidproductv is shoved onto the pallet during a movement of the said barwill result in the desired movement of the pallet longitudinally of andoutwardly upon the table 't as required torender the pallet capable ofreceiving the remainder of its load discharged or emerging from the dieextension c during the'said movement of the bar.

When the pallet has received its full load during apressure-exerting'stroke of the plunger, a removal of the laden palletfrom the table z5A is effected and another unladen pallet is placed inits load-receiving position upon the said table.

A feature of no inconsiderable importance consists in the provision ofmeans whereby the forward movement or progress of the plastic bar isarrested within the die extension at a point between the place at whichthe severing operations take place and the inner or receiving end of thedie, which means in the machine illustrated (see Figs. H, III, IV, andVlcomprises an abutment-forming verticallyarranged slide n, adapted tointerrupt continuity in the passage-way formed by and interiorly of thedie extension. The slide wis shown arranged at a suitable point betweenthe inner orl receiving end of the die exten- IIO sion and the placeatwhich the severing operations take place, and the top wall of the dieextension is slotted vertically and transversely, as at c',to'accommodate the location and operation of the said slide, and theside walls of the die extension (see also Fig. 1X) are provided withgrooves c2, which extend from top to bottom of the die extension and areopen at the ends and connect at their upper ends with the slot o. Thegrooves c2 therefore accommodate the location of the arms CZ, with whichthe slide u is provided and which-de- 'pend from the slide at oppositesides, respectively, of the die extension. It will be ob served,therefore, that two grooves c2 and c2 are formed directly opposite eachother in opposite side walls, respectively, of the passage-way formed byand interiorly of the die .extension and constitute slideways for theslide n and the depending slide-arms (Z, and the arrangement of parts issuch that the loweredge of the slide proper when the slide is in itsupper and inoperative position, as shown in Figs. III and V, shall be'Hush with 4the top wall of the said passage-way and the inner andopposing edges of theslide-arms d shall be Hush with the different sidewalls, respectively, of the said passage-way, as shown in Fig. IX, andtherefore the grooves c2 and the slot c are occupied by the slide a andits arms Z/ in the upper or elevated or inopera- `tive position of thesaid slide without protruding into the passage-way formed by and in-`vertically and widthwise to extend both vertically and widthwisecompletely across the said passage-way, so that the said slide in itslower and operative position, as shown in Figs. II and IV, forms anabutment for the outer end of the bar which is formed by .the die duringthe forcing of material into the die extension during thepressure-exerting vstrokes of the plunger, and I would here remark thatthe said slide is placed in its said lower and operative positionpreparatory to the operation of the machine, so that the forwardmovement or progress of the bar of eement or plastic material isarrested soon after `the commencement of the operation of the machineand a farther advance of the said bar 'is avoided until the die has beencompletely vand most compactly filled with material up to its receivingextremity, as shown in Fig. H,

vwhereupon the said slide, or abutment is elevated or withdrawn from theaforesaid passage-way and thereby rendered inoperative; but preferablythe said slide is left in its lower and operative position until thematerial between it and the receiving extremity of the die has receivedsuch compactness by the introduction thereinto of material forced intothe die during several successive pressure- `exerting strokes of theplunger that the internal walls of the die extension, whenever the barof material tends to expand by the pressure exerted upon its inner endby the plunger, shall resist and positively exert additional pressureupon the bar, so as to insure a wellformed bar of great compactness, anessential feature in making products of cement or eementitious material.Not unimportant, however, is a die extension e of great length, hecausethereby additional pressure is exerted by the internal walls of the dieextension upon the bar whenever the bar tends to expand by pressure uponits inner end by the plunger, so as to more properly and more closelyforce together the particles of the materials which compose the bar. Inother words, the object of a long` extension of the die in the directionin which the bar of plastic material is forced during the formation andlengthening of the bar is to place upon the bar, all round the bar, thefriction or resistance required to retard the progress of the bar, andthereby to increase the pressure on the bar and materially enhance thecompactness of the mass composing the bar by utilizing` to advantage thetendency of the said mass to expand during the pressure-exerting strokesof the plunger.

The slide n` may be shifted from the one to the other of its positionsmanually or other wise, and any suitable means capable ol holding thesaid slide in its upper and elevated position is provided, and the meansshown comprises a pin s, which is adapted to engage a hole c4, formed inthe upper end olE an upright arm or bracket c, arranged at one side ofthe path of the said slide and rigid with the top of the die extension,as shown in Fig. lll, which pin is shiftable endwise of and adapted toextend through the hole 1" into a corresponding hole n, formed in theslide n, and the arrangement of the parts is such that in tl 1e elevatedand inoperative position of the said slide the holes n and c are inregistry. 'l`he pin s is shown attached by a chain s to the bracket c3.Obviously the \\f'ithdrawal of the pin s from the slide fn, when theslide is in ils upper and inoperative position, releases the said slideand permits the slide to drop into its lower and operative position. lwould have it understood, however, that my invention, so far as a longdie extension and any means for arresting or retarding the movement ofthe plastic bar is concerned, is not limited to any details ofconstruction.

Again, referring to the severing operation,

.it will be observed that the top ol the die extension between the slotand its inner or receiving end and next to the said slot is providedwith a vertically-arranged wall c, which extends a suitable distanceabove the die extension and faces in the direction of the outer end ofthe die extension, and a row of knives (i are arranged over the dieextension between the said wall e and the outer end ol the die extensionand are pressed in the direction ol and against the said wall by a,suitably-applied spring-follower u, and the arrangement of parts is suchthat the knife nextto the said wall is in position ready to descendthrough the slot and the said slot is only wide enough to accommodatethe passage therethrough ol one knife at a time, and avertically-moval)le lOO IOS

llO

' in thickness to the thickness of a knife, is

shown arranged over the knife, which is in line with the slot d. Bymeans of the plate fw the last-mentioned knife is readily forced intoand through the bar In Figs. II and VII a plunger-forming plate w isshown ready 'to operate upon a knife e, and in Figs. III and VIII thesaid knife is. shown inserted into the bar b. rI`he plunger w is appliedand operated manually or otherwise, and obviously the wall c5 also formsa guide and lateral bearing for the said plunger w during the operationof the plunger.

The plunger f is provided centrally between its ends with an externalannular chamber f', and the case g is provided at the bottom of the saidchamber with a hole or slot g', which extends downwardly from the saidchamber and discharges downwardly, and the arrangement of the vparts issuch that the one or the other end of the chamber f is in position overthe upper and receiving end of the slot or hole g', according as theplunger is in the one or the other of its extreme positions, andobviously material obtaining ingress between the opposing surfaces ofthe plunger f and the case g will upon reaching the chamber f be carriedby the end walls of the said chamber during the reciprocation of theplunger to and over the hole g and there escape from the case g.

rlhe mechanism for operating the'plungerf comprises, preferably, apitman f2, which establishes operative connection between the plungerand the crank of va crank-shaft (see Figs. I, X, and XL) which isarranged horizontally and at right angles to the path of the plunger andsupported in any approved manner. The crank of the'shaft w is preferablyin the `form of a double-wheel crank comprising two wheels and w', whichare of no inconsiderable size diametrically and are con- 'nectedtogether by a Vpin m2, which forms the wrist of the crank and isembraced by the adjacent end of the pitman. Spur-teeth w3 are formedupon the periphery of each wheel at equal intervals circumferentially ofthe wheel, and each wheel m is also provided with a groove, slot, orguideway m4, which extends around the axis of the wheel and has thetrend required to forma cam, It will be observed, therefore, that eachwheel fr is a combined spur-gear and crank provided with a cam, and bothwheels x' correspond diametrically, and the cams of both wheels areuniform in trend and arrangement.

The slide j' is provided with two corresponding and parallelroller-bearing arms j and j', which extend toward the crank of the shaftw, and the roller f2 of one of the said arms engagesl the cam-formingguidewayof one of the wheels and the roller of the other arm j engagesthe cam-forming guideway of the other wheel w. i

The arrangement of the parts and thetrend of the cams of the wheels aresuch that the slide 7' is closed after the completion of each idlestroke of the plunger, so as to avoid displacement of material into theoutlet of the hopper during the next succeeding pressureexerting strokeof the plunger and remains closed while the said plunger is forcingmaterial into the die and commences to open upon the completion of eachpressure-exerting stroke of the plunger to permit a new charge ofmaterial from the hopper to and in advance of the plunger during thenext succeeding idle stroke of the plunger.

rl`he wheels have their toothed peripheries in mesh With pinions y',which are operatively mounted upon a shaft y, supported in any approvedmanner and shown arranged belowthe case g and parallel with thecrank-shaft, and the shaft y is operatively provided with spur-gears y2,which mesh with pinions g3 of the driving-shaft yf, which is supportedin any approved manner and operatively provided with a driving-pulleyg5, to which power is applied in the usual manner.

What I claim isl. The combination, with an open-ended forming-die havingan extension provided interiorly with an open-ended passage-way andmeans for forcing the plastic material into the die and into itsextension, of anl abutmentforming slide extending in one of itspositions transversely of the aforesaid passage-way and into twoopposing walls of the said passageway and through one of the remainingwalls, which slide is removed from the said passageway in its otherposition` and theaforesaid opposing Walls being grooved or cut away toform slideways for the slide and the slide having arms arranged tooccupy the said slideways in the non-'obstructive position ofthe slide.

2. The combination, with an open-ended forming-die having an extensionwhich has an interiorly-open-ended passage-way and is provided, in oneof its walls, with a slot extending transversely of the said extension,and means for forcing the plastic material into the die and into itsextension, of an abutmentforming wall arranged at one side of andparallel with the said slot; 'a row of knives arranged at that side ofthe said wall at which the aforesaid slot is located and parallel withthe said slot and having the dimensions required to render them capable,respectively, of passing into the aforesaid passage-Way through the slotand cutting or severing a section from the bar within the saidpassageway, and means acting to holdA the said row of knives against theaforesaid wall, and the aforesaid slot having the dimensions andarrangement required to accommodate the operation of only one knife at atime.

3. The combination, with an open-ended forming-die having an extensionwhich has an IOO interior open-ended passage-way and is provided, in oneof its walls, with a ,slot extending transversely of the said wall, andmeans for forcing the plastic material into the die and into itsextension, of an abutment-forming wall arranged at one side of andparallel with the aforesaid slot; a row of knives arranged at that sideof the said wall at which the said slot is located and parallel with theslot and having the dimensions required to render them capable,respectively, of cutting or severing a section from a bar in theaforesaid passage-Way, and a spring-follower acting to hold the said rowof knives against the aforesaid wall, and the aforesaid slot having thearrangement and dimensions required to accommodate the reception therebyand operation of only one knife at a time.

4. The combination, with an open-ended forming-die having an extensionwhich has an interior open-ended passage-Way and is provided, in one ofits walls, with a slot extending transversely of the said wall, andmeans for forcing the plastic material into the die and into itsextension, of an abutment-forming wall arranged at one side of andparallel with the aforesaid slot; a row of knives arranged at the sideof the said wall at which the said slot is located and parallel with theslot and having the dimensions required to render them capable,respectively, of cutting or severing a section from a bar in theaforesaid passage-way; means acting to hold' the said row of knivesagainst the aforesaid wall, and a plunger-forming plate arranged toengage one knife at a time and actuate the same into the die extension,and the aforesaid slot having the arrangement anddimensions required toaccommodate the operation of only one knife at a time.

5. The combination, with an openended forming-die having an extensionwhich has an interior open-ended passage-way and is provided in one ofits walls with a slot extending transversely of the said wall, and meansfor forcing material to be operated upon into the die, of anabutment-forming wall arranged at one side of and` parallel with theaforesaid slot externally of the aforesaid passage-way, a knife arrangedat that side of the said wall at which the said slot is located andparallel with the slot and having the dimensions required to render itcapable of cutting or severing a portion of a bar in the aforesaidpassage-way, means acting to hold the knife against the said wall, andmeans for actuating the knife into the said passage-way at the aforesaidslot and leaving the knife in said passage-way, and the said slot havingthe arrangement and dimensions required to accommodate the operation ofthe knife.

6. The combination, with an open-ended .forming-die havine' an extensionwhich has an interior open-ended passage-way and is provided, in one ofits walls, with a slot extending transversely of the said wall, andmeans for forcing the material to be operated on into the die, of anabutment-forming wall arranged at one side of and parallel with theaforesaid slot: a knife arranged at the side of the said wall at whichthe said slot is located and parallel with the slot and having' thedimensions required. to render it capable of cutting` or severing a,section from a bar in the aforesaid passageway; means acting to hold thesaid knife against the aforesaid wall, and a plunger-forming platearranged to actuate the said knife into the aforesaid passage-way, andthe aforesaid slot having the arrangements and dimensions required toaccommodate the operation of the said knife.

7. The combination,with an open-ended forming-die arranged in ahorizontal plane, a plunger arranged in line with the die, a caseforming a guideway for the plunger and in open relation with the die, ahopper arranged to discharge into the said case and into the die inadvance of the plungeiwluring the idle strokes of the plunger, and aslide arranged to close the outlet of the hopper from below and restingand having bearing upon the plunger, of a crank-shaft having adoublewheel crank whose wrist' extends between the two wheels of thecrank, which wheels correspond diametrically and are arranged at one endof the said travel and have correspomling cam-forming guideways and areuniformly toothed upon their peripheries to form spurgears; rollersengaging the aforesaid camforming guideways and borne by the aforesaidslide; a pitman operatively connecting the wrist of the crank with theplunger; pinions meshing with the aforesaid sl'mr-gears. and means fordriving the shaft, and the arrangement of the parts and the trend of theaforesaid guideways being such that the slide shall be actuated into aclosing position after each idle stroke of plunger and remain closedlong enough to avoid displacement of material from in advance of theplunger into the outlet of the hopper during the next succeedingpressure-exerting stroke of the plunger and shall again open upon thecompletion of the said last-mentioned stroke of the plunger.

In testimony whereof l sign the foregoing specification, in the presence of two witnesses, this 12th day of April, 1902.

lVlLLlAM E. J AQU ICS.

lVitnesses: Y

C. H. Donna, TnLsA Scnwan'rz.

